Rock-drill machine



. 2" sheets shet 1.

(No M9de1.).

W ARNOLD ROCK DRILL MACHINE.

darn/0M Ens co., mum-urns wunmmon, n. c.

(No Model.) 2 sheefs -shevet 2.

W ARNOLD ROCK DRILL MACHINE.

Patentad Man 22, 1892;

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Wa/Qr flrlwlab NITED STATES WALTER ARNOLD, OF ST. CLOUD, MINNESOTA.

ROCK-DRILL MACHINE.

SPECIFICATION forming part of Letters Patent No. 471,331, dated March 22, 1892.

Application filed October 22, 1891. Serial No. 409,462. (No model.)

have invented certain new and useful Im-- provements in Rock-Drilling Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to stationary rockdrilling machines, in which the quarry-bar carrying the drill-holder is pivoted at both ends in vertically-adjustable nuts; and the objects of my improvement are to provide a simple and reliable means for retaining the quarry-bar locked to the frame of the machine, and simple means, also, to advance the drill-holder and clamp it to the quarry-bar. I attain these objects by the construction illustrated in the accompanying drawings, in which- Figure 1 is a front view of a rock-drilling machine constructed in accordance with my invention. Fig. 2 is a vertical section of the same. Fig. 3 represents, on a larger scale, a horizontal section of one of the twin posts of the frame and a top view of the clampingyoke and its adjuncts used to lock the quarrybar. Fig. 4 is a front view of the yoke. Fig. 5 is a front view of the operating-lever detached from the yoke. Fig. 6 is a transverse vertical section of the quarry-bar, showing, also, a side view of the drill-holder carrier. Fig. 7 is a top view of the same.

In. said drawings, A represents the twin posts of the frame, connected together at their upper ends by the top beams B. Between each of the twin posts is placed a screw 0, having its lower end received in a shoe 0 and its upper end received in a guide-plate c screwed on the top of the beams B. Each screw passes through a nut 0 Fig. 3, that is guided by the posts A, and said nuts contain the bearings for the journals d of the quarrybar D. To rotate the screws 0, each one carries on its upper end a bevel-gear 0 that meshes with a bevel-gear e upon a horizontal shaft E, received in bearings on top of the beams B, and to rotate this shaft it carries toengage.

also a bevel-gear (2 near one end, and said gear meshes with a bevel-gear f on the upper end of a vertical shaft F. On the lower end of said shaft there is a bevel-gear f that meshes with a bevel-gear 9 upon a horizontal counter-shaft G, that carries also a crank 9 by which it can be rotated. The drill-holder D is suitably secured to the quarry-bar D, and the latter can be rotated on its journals d, but to retain it at any point of its rotation with the drill pointing in any desired direction said bar D has secured on one end thereof a toothed wheel (1 with which the teeth on the under side of a yokeNare made Said yoke extends across the face of one of the pairs of posts A, and has hooked ends a to engage with the edge of rack-bars a vertically secured to the posts A. To clamp the yoke to the posts one of the hooked ends has two ribs n projecting from its face, and through said ribs is passed a pivot-pin that passes also through the head of the handle N To the head of said handle there is pivoted a wedge-pointed pawl 19, and under the latter a second pawl p havinga serrated end, which when the handle 72 is depressed enters into engagement with the teeth of the rack a The other hooked end of the yoke N has a perforation which is screw-tapped and receives a screw 3, through the head of which is a hole to receive the handle 8 Retained connected to the rounded end of the screw '8 by a concave socket-joint is a wedge-shaped block 5 which is pressed against the rack a by means of the screw 8. The quarry-bar is a beam I-shaped in cross-section, and has a rack-bar d fastened to the under side of one of its upper flanges. Meshing with this rackbar is a pinion R, which is secured to one end of ashaft r. This shaft passes through the back of the drill-holder D and carries on its outer end a hand-wheel r which can be operated by the handle r thereon. By turning the wheel r the pinion meshing with the rack 61 moves the drill-holder D along the quarrybar D. To secure the drill in any desired position on the quarry-bar, the rear plate of the drill-holder has a perforation screw-tapped to receive the screw t, through the head of which passes the handle 9, by means of which said vei' in the opposite end with aquai'ry-bar havscrew can be revolved and pi'essed against ing a toothed Wheel thereon for engagement the web of the quarry-bar. with the teeth of the yoke, substantially as Having now fully described my invention, described. 5 I e1ain1- In testimony whereof I aifix my signature in I 5 The combination of the posts of a rock-drill presence of two Witnesses. frame, racks secured to the sides of said posts, XVALTER ARNOLD. a yoke embracing said racks and having teeth Witnesses: on its under side, a hand-screw inserted in ANDREW G. ROBERTSON,

10 one end of said 01:0 and a ){LWl-Oitll in le- THOMAS W. ROBERTS. 

